High-global warming potential F-gas emissions in California: comparison of ambient-based versus inventory-based emission estimates, and implications of refined estimates.
In: Environmental science & technology, Jg. 48 (2014-01-06), Heft 2
academicJournal
- 1084 - 1093
Zugriff:
To provide information for greenhouse gas reduction policies, the California Air Resources Board (CARB) inventories annual emissions of high-global-warming potential (GWP) fluorinated gases, the fastest growing sector of greenhouse gas (GHG) emissions globally. Baseline 2008 F-gas emissions estimates for selected chlorofluorocarbons (CFC-12), hydrochlorofluorocarbons (HCFC-22), and hydrofluorocarbons (HFC-134a) made with an inventory-based methodology were compared to emissions estimates made by ambient-based measurements. Significant discrepancies were found, with the inventory-based emissions methodology resulting in a systematic 42% under-estimation of CFC-12 emissions from older refrigeration equipment and older vehicles, and a systematic 114% overestimation of emissions for HFC-134a, a refrigerant substitute for phased-out CFCs. Initial, inventory-based estimates for all F-gas emissions had assumed that equipment is no longer in service once it reaches its average lifetime of use. Revised emission estimates using improved models for equipment age at end-of-life, inventories, and leak rates specific to California resulted in F-gas emissions estimates in closer agreement to ambient-based measurements. The discrepancies between inventory-based estimates and ambient-based measurements were reduced from -42% to -6% for CFC-12, and from +114% to +9% for HFC-134a.
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High-global warming potential F-gas emissions in California: comparison of ambient-based versus inventory-based emission estimates, and implications of refined estimates.
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Autor/in / Beteiligte Person: | Gallagher, Glenn ; Zhan, Tao ; Hsu, Ying-Kuang ; Gupta, Pamela ; Pederson, James ; Croes, Bart ; Blake, Donald R ; Barletta, Barbara ; Meinardi, Simone ; Ashford, Paul ; Vetter, Arnie ; Saba, Sabine ; Slim, Rayan ; Palandre, Lionel ; Clodic, Denis ; Mathis, Pamela ; Wagner, Mark ; Forgie, Julia ; Dwyer, Harry ; Wolf, Katy |
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Zeitschrift: | Environmental science & technology, Jg. 48 (2014-01-06), Heft 2 |
Veröffentlichung: | eScholarship, University of California, 2014 |
Medientyp: | academicJournal |
Umfang: | 1084 - 1093 |
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